Brake shoe



July 21, :1936. w. H. DELAHAYEV BRAKE SHOE Filed Aug. 14, 1931 \lkollllll/f 3, 4/11? INVENTOR: WALTER H DE LAHAYE.

BY ATTOEN EY Patented July 21, 1936 UNITED STATES PATENT OFFICE BRAKE SHOE Walter H. Delahaye, Ottawa, Ontario, Canada, assignor to Bendix Brake Company, South Bend, Ind., a corporation of Illinois Application August 14, 1931, Serial No. 557,023

2 Claims. (01. 188-250) therefore stretched with respect to the inner or webbed part, and the difference between the stresses and strains of the two parts gives to the webbed part a tendency to buckle, which must be restrained or corrected.

The present invention has for its object to provide a shoe made from T, angle, channel, or similar stock which is bent to arcuate form in such a manner that the resulting shoe has no tendency for the webbed portion to buckle.

According to the invention, portions of the web I are displaced laterally to form recesses, scallops or corrugations therein. This controlled buckling or undulating of the web or webs causes the flanged part to assume the desired arcuate shape, but the actual, overall length of the webbed part remains the same as that of the flanged part, so that substantially no tensile or compressive stresses are imparted to the webbed or flanged portions which would cause them to become distorted.

The invention consists in the steps, construction and arrangements hereinafter described and more particularly pointed out in the appended claims.

Referring now to the accompanying drawings, which illustrate, by way of example, several embodiments of the invention:-

Figure l is a side elevation of a length of metal being bent to arcuate shape in accordance with the improved method;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is an inverted plan of a modified form of metal section for use in connection with the invention;

Figure 4 is a side elevation of a modified form of shoe, and

Figures 5 and 6 are fragmentary views of further modifications.

Figure '7 is a sectional view taken on line 11 of Figure 5, and

Figure 8 is a sectional view taken on line 88 of Figure 6.

According to the form of the invention shown in Figures 1 and 2, a straight length l of. metal of T-section is bent into an arcuate shape 2 by pressing a series of recesses or scallops 3 in the web 4. The transverse or flanged portion 5 of the metal bears the brake lining in the usual way. The edge of the web, when scalloped, may thus be made the same length as the flanges 5, so that the inner portion of the web is under substantially the same stresses as the outer portion. Consequently there is no tendency for the shoe to buckle after manufacture. In other words, the present invention substitutes a uniformly distributed, predetermined buckling for the non-uniform, fortuitous buckling which occurs when the webbed metal is bent in the usual way.

Alternate scallops are preferably pressed in opposite directions as indicated in Figure 2, and, if desired, the web may be made thinner at the points where the scallops are to be made, as indicated in Figure 3.

Figure 4 illustrates a shoe made from metal of L-section comprising a flange 6 and web 1. Scallops 3a are produced in the web to bend the shoe to the desired arcuate shape, and to aid the presstion having a flange l0 and parallel webs II. The

scallops 3b of the two webs are arranged side by side and spaced apart slightly, The parallel parts l2 of the scallops 3b may be perforated to receive the pivots of any flat actuating linkage, not shown.

In Figure 6 two angles having flanges l3 and webs M are arranged back to back. The scallops may be made opposite each other as at l5, or staggered as at I6. They may also be elongated as at I? so as to provide sufiicient space for a pivot. Wear plates l8 may be connected to the interior surfaces of the scallops and perforated at l9 to receive pivots.

I claim: v

1. A brake shoe comprising a metal stamping L shaped in cross-section and having an arcuate flange portion and an integral, scalloped web portion.

2. A brake shoe comprising a pair of metal angles each having an arcuate flange and an integral scalloped web, the webs being secured together with certain of the scallops registering with each other and perforated for the purpose described.

WALTER H. DELAHAYE. 

